Question

A dipole $P_1$ is placed as shown in figure. Then work done to bring another dipole $P_2$ from infinity to separation r from $P_1$ as shown in figure is.

• A. $0$
• B. $\frac{2K{P}_1{P}_2}{r^3}$
• C. $\frac{-K{P}_1{P}_2}{r^3}$
• D. $\frac{K{P}_1{P}_2}{r^3}$

Answer 1

The correct option is A $0$


Potential at point A due to $P_1$ is zero.
So, potential energy of interaction between $P_1\&P_2$ when $P_2$ is placed at A is also zero.
Hence, work done is zero.